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Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Caledonite from
Bwlch Glas Mine, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK


05427180017367131903123.jpg
Caledonite

Bwlch Glas Mine, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
05427180017367131903123.jpg
Caledonite

Bwlch Glas Mine, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
05427180017367131903123.jpg
Caledonite

Bwlch Glas Mine, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
Locality type:Mine
Classification
Species:Caledonite
Formula:Pb5Cu2(SO4)3(CO3)(OH)6
Comments:Light blue xls to 0.5mm with cerussite, susannite.
Habit:Prismatic
Colour:Blue
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Very Rare
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Associated Minerals:
Associates:Anglesite
Cerussite
Chenite
Galena
Mattheddleite
Quartz
Susannite
Data
Mineral Data:Click here to view Caledonite data
Locality Data:Click here to view Bwlch Glas Mine, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
Data Identifiers
Mindat Occurrence Record ID:37712
Long-form Identifier:1:3:37712:4
GUID (UUID V4):0
Nearest other occurrences of Caledonite
1.9km (1.2 miles) ⓘHafan Mine (Canninog Mine; Bwlch Canninog Mine), Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
3.0km (1.9 miles) ⓘEaglebrook Mine, Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
3.6km (2.2 miles) ⓘBryn-yr-Afr Mine, Ponterwyd, Trefeirig, Ceredigion, Wales, UK
3.9km (2.4 miles) ⓘLlechwedd Helyg Mine (Willow Bank Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion, Wales, UK
4.2km (2.6 miles) ⓘEsgair Hir & Esgair Fraith mines (Cambrian Mine; Cardigan Consolidated Mine; Welsh Potosi Mine; Kylon Potosi Mine), Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
5.3km (3.3 miles) ⓘBwlchrhennaid Mine (Level Newydd Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion, Wales, UK
5.6km (3.5 miles) ⓘPenpontbren Mine (Penypontbren Mine; Penpombren Mine), Tal-y-bont, Ceulanymaesmawr, Ceredigion, Wales, UK
5.7km (3.5 miles) ⓘDaren Mine (Old Daren Mine; Darren Consolidated Mine; Daren United Mine; Great Darren Mine; Darren Mine), Pen-bont Rhydybeddau, Trefeirig, Ceredigion, Wales, UK
5.8km (3.6 miles) ⓘBrynarian Mine (Cardigan Bay Consols Mine), Tre-Taliesin, Llangynfelyn, Ceredigion, Wales, UK
5.8km (3.6 miles) ⓘPenybanc Mine, Tre-Taliesin, Llangynfelyn, Ceredigion, Wales, UK
References
Rust, S. A. (1996) Susannite and Caledonite in Situ in Central Wales. UK Journal of Mines and Minerals 17, 18
 
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